Orchestes fagi

Adults can be monitored using yellow, green, or white sticky triangular prism traps, which capture significantly more individuals than other colours or trap designs. Light blue, dark blue, and red traps are less effective. No specific morphological distinguishing features from similar Orchestes species are described in available sources.

Forested areas containing beech trees; in Europe associated with Fagus sylvatica, in North America with Fagus grandifolia. Adults overwinter on the base, middle, and upper boles of host trees and adjacent species including red maple (Acer rubrum) and red spruce (Picea rubens), favoring areas with relatively high bark roughness. Rarely found on branches, moss, duff, or soil beneath trees.

Native to Europe (including Belgium); invasive in eastern North America, specifically established in Nova Scotia, Canada with multiple distantly distributed populations reported.

Adults are present on woody stems from July through May, reflecting an extended diapause period. In Nova Scotia, active adults captured in traps; specific seasonal activity patterns in native range not detailed in sources.

Larvae mine the leaves of beech trees (Fagus species). Adult feeding habits not explicitly described in available sources.

• Fagus sylvatica - primary hostEuropean beech; native host in Europe
• Fagus grandifolia - primary hostAmerican beech; invasive host in Nova Scotia, Canada
• Acer rubrum - overwintering siteRed maple; adults found on boles near outbreak areas
• Picea rubens - overwintering siteRed spruce; adults found on boles near outbreak areas

Adults undergo diapause for eight to nine months of the year, overwintering on tree boles. Larval stage mines leaves of beech trees. Specific details on egg laying, larval development duration, pupation, and generation time not described in available sources.

Adults favor overwintering on parts of trees with relatively high bark roughness. Between July and May, woody stems near outbreak areas harbor diapausing adults. Adults are attracted to yellow, green, and white visual stimuli. Baiting traps with the host volatile 9-geranyl-p-cymene does not increase capture rates.

Leaf-mining herbivore of beech trees; in North America, an invasive pest contributing to stress on American beech populations. Firewood and timber transport facilitate range expansion, creating forestry management concerns.

Pest of ornamental and forest beech trees in North America. Human-mediated spread occurs through transport of firewood and timber containing overwintering adults. Monitoring programs using coloured sticky traps are deployed to track invasion spread in Canada.

• Orchestes steppensisAnother invasive weevil species from Asia that mines leaves of elms; previously misidentified as European elm flea weevil. Distinguished by host association (elm vs. beech) and geographic origin.

• invasive species
• leaf miner
• forest pest
• Coleoptera
• Curculionidae
• Fagus
• beech
• diapause
• firewood vector

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
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• Influence of trap colour, type, deployment height, and a host volatile on monitoring Orchestes fagi (Coleoptera: Curculionidae) in Nova Scotia, Canada
• Hitching a ride: firewood as a potential pathway for range expansion of an exotic beech leaf-mining weevil, Orchestes fagi (Coleoptera: Curculionidae)
• Influence of trap colour, type, deployment height, and a host volatile on monitoring Orchestes fagi (Coleoptera: Curculionidae) in Nova Scotia, Canada–ERRATUM